Brake



Sept. 12, 1933- R. A. GOEPFRICH 1,926,379

BRAKE Filed Dec. 21, 1931 p I j 54 28 INVENTOR. 46 EUDOLPHHC'OEPFE/CH A TTORNEYI Patented Sept. 12, 1933 PATENT OFFICE BRAKE Rudolph A. Goepfrich,

South Bend, Ind. as-

signor to Bendix Aviation Corporation, South Bend, Ind., a Corporation of Delaware Application December 21, 1931 Serial No. 582,430

6 Claims. (CL 18879.5)

This invention relates to brakes, and more particularly to adjusting means therefor.

Broadly, the invention comprehends an adjusting means for the friction elements of an internal expanding brake. In the illustrated embodiment the friction elements of the brake include a primary shoe and a secondary shoe connected at their articulated ends by an adjusting device comprising a cylindrical member having a concentric portion slotted to receive one of the shoes, and

threaded in the cylindrical member is a sleeve having a thumb nut upon its outer end. The sleeve is internally threaded to receive a bolt having a slot for the reception of the other shoe. The external and internal threads on the sleeve are reversed, so that upon rotation of the sleeve the cylindrical member and the bolt are simultaneously moved in opposite directions to spread or retract the shoes, according to the direction of the sleeve, as may be desired.

An object of the invention is to provide an exceedingly cheap and simple adjusting device, which may be easily and quickly assembled and installed or removed, and will proficiently perform its intended function.

Another object of the invention is to provide an adjusting device having relatively few parts assembled in a compact unique structure.

A further object of the invention is to provide an adjusting device of the character described which may be produced at a relatively low cost, and on which the required amount of machined work may be reduced to a minimum.

A feature of the invention is an adjusting device having but three parts, two of which may be moved in opposite directions by rotating the third part.

Another feature of the invention is an adjusting device which may be constructed in compact form and will occupy relatively small space.

Other objects and features of the invention will appear from the following description taken in connection with the drawing which forms a part of this specification, and in which:

Figure 1 is a vertical sectional view of the brake, taken just back of the head of the drum, illustrating the friction elements in side elevation and showing the invention as applied; and

Figure 2 is a sectional view substantially on line 22, Figure 1.

Referring to the drawing for more specific details of the invention, 10 represents a fixed support, such as a backing plate. The backing plate has associated therewith a rotatable drum 12.

The backing plate has positioned thereon an anchor 14 and suitable steady rests 16 and 18.

Positioned on the steady rests 16 and 18 is a primary shoe 20 and a secondary shoe 22. Each of the shoes includes a web 24 supporting a rim 26 to which is suitably. secured a lining 28 adaptable for cooperation with the drum. The articulated ends of the shoes are connected by an adjusting device indicated generally at 30. The separable ends of the shoes are notched to receive the anchor 14, and positioned on the anchor between the separable ends of the shoes is an operating cam lever 32 connected by a draft cable 34 to a suitable operating means, not shown.

The primary shoe 20 and the secondary shoe 22 are connected by suitable return springs 36 and '38, and the secondary shoe 22 is connected by an auxiliary return spring 40 to the anchor 14. The springs serve to return the shoes to the ofi position upon release of the brake.

The adjusting means includes a hollow cylindrical member 42 having formed-integral therewith and concentric thereto a cylindrical section 44 slotted as indicated at 46 to receive the articulated end of the primary shoe 20. The 11013 low cylindrical member 42 has threaded therein a sleeve 48 provided on its outer end with a thumb nut 50. The sleeve 48 is internally threaded to receive a cylindrical member 52. This member is slotted as indicated at 54 to receive the articulated end of the secondary shoe. It will, of course, be understood that the position of the adjusting device may be reversed to engage the slot 46 with the secondary shoe and the slot 54 with the primary shoe.

The internal and external threads on the sleeve member run in reversed directions, so that upon turning the sleeve the hollow cylindrical section 42 is moved in one direction and the cylindrical member 52 is moved in the reverse direction. The movement of the sleeve 48 may be accomplished by inserting a suitable tool through an opening 56 in the backing plate and engaging the thumb nut 50. By manipulating the sleeve 48 the over-all length of the friction elements may be adjusted tocompensate for wear on the friction lining on the shoes.

Although this invention has been described in connection with certain specific embodiments, the principles involved are susceptible of numerous other applications that will readily occur to persons skilled in the art. The invention is, therefore,to be limited only as indicated by the scope of the appended claims. v

Having thus described the various features of the invention, what I claim as new and desire to secure by Letters Patent is:

IwAn adjusting device comprising a sleeve, a member threaded on the sleeve having a slot in its free end, a memberthreaded in the sleeve having a slot in its free end, and parts connected by the adjusting device and seated in said slots and holding said members from turn- 2. An adjusting device comprising a sleeve, a member positioned. for travel in the sleeve having a diametral slot, a member positioned for travel on the sleeve having a diametral slot, and parts connected by the adjusting device and seated in said slots and holding said members from turning.

3. An adjusting device comprising a sleeve -having internal and external threads of opposite lead, a member positioned for travel on the external threads having a slot, a member positioned for travel on the internal threads having a slot, and parts connected by the adjusting device and seated in said slots and holding said members against turning.

4. A brake comprising a primary shoe and a secondary shoe and means connecting the articulated ends of the shoes including a sleeve having internal and external threads of opposite lead, a member threaded on the sleeve having a slot receiving one of the shoes, and a member threaded in the sleeve having a slot receiving the other shoe.

5. A brake comprising a primary shoe and a secondary shoe and means for adjustably connecting the shoes including a sleeve having internal and external threads of opposite lead, a member threaded on the sleeve having a diametral slot receiving one of the shoes, and a member threaded in the sleeve having a), slot receiving the other shoe.

6. A brake comprising a fixed support,-a drum associated therewith, a friction element having two parts on the support adaptable for cooperation with the drum, means for adjusting the friction element including a sleeve having internal and external threads of opposite lead, a member positioned for travel on the external threads engaging one of the parts of the friction element, and a member positioned for travel on the internal threads engaging the other part of the friction element.

RUDOLPH A. GOEPFRICH. 

